| Item | Part No. | Part Name | Qty | Serial No. |
| (258-80-57100) | OIL PUMP ASS'Y,HST | 6001- | ||
| THIS ASSEMBLY CONSISTS OF ALL PARTS SHOWN IN FIGS.6101 AND 6102. | ||||
| 1 | 257-81-41780 | SPACER | 6001- | |
| 2 | 257-81-41790 | GASKET | 6001- | |
| 3 | 257-81-11270 | PIN | 6001- | |
| 4 | 258-81-55310 | PISTON | 6001- | |
| 5 | 257-81-41830 | SPRING | 6001- | |
| 6 | 258-81-55320 | SPRING | 6001- | |
| 7 | 258-81-55330 | SPRING | 6001- | |
| 8 | 257-81-41860 | RING | 6001- | |
| 9 | 257-81-41870 | RING | 6001- | |
| 10 | 257-81-41880 | WASHER | 6001- | |
| 11 | 258-81-55340 | SCREW | 6001- | |
| 12 | 257-81-41910 | BLOCK | 6001- | |
| 13 | 257-81-41920 | PIN | 6001- | |
| 14 | 257-81-41930 | PIN,SPRING | 6001- | |
| 15 | 257-81-41940 | SCREW | 6001- | |
| 16 | 257-81-41950 | ARM | 6001- | |
| 17 | 257-81-41960 | SLEEVE | 6001- | |
| 18 | 257-81-41970 | SPOOL | 6001- | |
| 19 | 257-81-41980 | RING | 6001- | |
| 20 | 258-81-21550 | RING | 6001- | |
| 21 | 257-81-41990 | O-RING | 6001- | |
| 22 | 258-81-22620 | SPRING | 6001- | |
| 23 | 258-81-22640 | BRACKET | 6001- | |
| 24 | 258-81-22630 | HANDLE | 6001- | |
| 25 | 258-81-22660 | WASHER | 6001- | |
| 26 | 258-81-22610 | NUT | 6001- | |
| 27 | 258-81-22490 | SCREW | 6001- | |
| 28 | 258-81-55350 | COVER | 6001- | |
| 29 | 258-81-55360 | COVER | 6001- | |
| 30 | 257-81-42180 | GASKET | 6001- | |
| 31 | 258-81-55510 | GASKET | 6001- | |
| 32 | 257-81-42190 | SEAL | 6001- | |
| 33 | 257-81-42210 | SCREW | 6001- | |
| 34 | 258-81-55520 | NUT | 6001- | |
| 35 | 258-81-55530 | NUT | 6001- | |
| 36 | 266-81-62260 | PLUG ASS'Y | 6001- | |
| 37 | 266-81-62260 | PLUG ASS'Y | 6001- | |
| 38 | 258-81-55540 | PLUG | 6001- | |
| 39 | 257-81-42250 | SCREW | 6001- | |
| 40 | 258-81-55550 | SCREW | 6001- | |
| 41 | 258-81-55560 | VALVE | 6001- | |
| 42 | 258-81-55560 | VALVE | 6001- | |
| 43 | 257-81-41940 | SCREW | 6001- | |
| 44 | 257-81-42270 | PLUG | 6001- | |
| 45 | 257-81-42280 | PLUG | 6001- | |
| 46 | 258-81-55570 | SCREW | 6001- | |
| 47 | 258-81-55580 | WASHER | 6001- | |
| 48 | 258-81-55590 | HANDLE | 6001- | |
| 49 | 258-81-55610 | SPACER | 6001- | |
| 50 | 2692-8-48550 | O-RING | 6001- | |
| 51 | 258-81-21550 | RING | 6001- | |
| 52 | 258-81-21560 | O-RING | 6001- | |
| 53 | 258-81-55620 | VALVE,BYPASS | 6001- |